Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 493
imes they are ground in, which appears to be the preferable (U^practice. The beam is set upon its edge on two blocks of wood; a straight-edge is appliod to ascertain if it is nearly straight, and ifbent or twisted it is brought straight by being hammered with theface of the hammer, though this… … the end centres are put through, staked with wedges, and levelled by means of a short level with twolegs passing down from the edge of the beam. The lengths from the main centre are next ascertainedto be right, and the main centre is then put in, using the end centres as points to measure…
Mechanical engineering
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